Electric rivet-furnace.



' ELECTRIC RIVEI. FURNACE.-

APPLIGATION FILED .TAN.27,1913.

Patented Nov. 11, 1913.

11v VEN TORS William '15. Jakrwan I WITNESSES UNITED STATES PATENT QFFlCl L WILLIAM S.

JOHNSON AND JOY-IN 'W'. SHEFFER, OF BERWIGK, PENNSYLVANIA, 263- SIGNCRS TO THE AMERISAN CAR AND FQUNDRY COMPANY/OF LOUIS, MISSOURI,

A CORPORATION" OF NEW JERSEY.

ELECTRIC RIVET-FURNACEQ Application filed January 2?, 1913.

To all whom it may concern.

Be it; known that we, TILLTAIYK S. Jonx- SON and Jenn \V. Snnrrnn, residing at Berwiclr, Columbia count-y, Pennsylvania, and being citizens of the United States, have invented certain new and useful Improvements in Electric ltivet-l urnaces, of which the following is a full, clear, and exact de scription, such as will enable others skilled in the art to which it appertains to make and to use the same, reference being had to the accompanying drawings, which illustrate the preferred form of the invention, though it is to be understood that the invention is not limited to the exact details of construction shown and described, it is obvious that various modifications thereof will occur to persons skilled in the art.

In said drawings: Figure 1 is a front ele Vation of an electric rivet furnace constructed to disclose a preferredembodiment of our invention. Fig. 2 is a vertical, transverse, sectional view of the same taken on a plane indicated by the line 22 of Fig. l, and looking in the direction of th arrows. Fig. 3 is a plan view looking down upon the device-shown in Figs. 1 and 2. Fig. ,4 is a side elevation of the device looliin from the left-hand side of Fig. 1, and Fig. o is a ver-- tieal, sectional *iew showing the link conneption with the movable electrode. Y

Qur invention relates to an electric rivet fii rnace, and it is a primary object of the electrode of the secondary of a transformer,

with the headed end of the rivet inclosed and bring down on the pointed end oi the rivet the other electrode or the secondary, thus completing the circuit.

The invention further resides in the con- ,1? structlon or a neat, readily transportable Specification of Letters Patent.

Patented Nov. 1 1, 1913.

Serial No. 744,522.

furnace which may be operated by a foot pedal or hand lever, and which may be readily adjusted to accommodate different size rivets.

Described more in detail we have shown a suitable support A, mounted upon which the leads constituting the primary G, whichis in circuit with a suitable source of electric energy H, this circuit being cmitrollcd, if desired, by means of a service switch. J, but it is to be understood that the operation of the device does not depend upon this service. switch, the circuit being completed through the secondary by means hereinafter more fully described.

Disposed in juxtaposition to the primary G and disposedwithin the boxing F is a relatively long metal strip, preferably of copper, constituting the secondary K. This secondary is suitably held in position and extends above and below the boxing F for some material distance. Extending laterally from the lower portion of the strip K and fastened thereto by means of a bolt 3 is an L-shaped copper plate 4, hereinafter referred to as the stationary electrode, which electrode is insulated from the transformer by means of a sheet of insulating material 5, and 'is held to the lower plate 0 by means of a bolt 6, passing through an insulating bushing 7, thereby insulating the stationary electrode a from the support A.

Resting upon the stationary electrode l and abutting the front edge of the sheet 5 and the plates B and C and extending for some distance above the top plate B is the board 8 of insulating material, such as fiber, the front face of which board is recessed to form a dove-tailed vertical groove, which board will hereinafter be referred to as a guide. Slidably mounted within the groove is the upstanding plate-9 of an Lshapcd movable electrode 10, the horizontal ledge 11 of which extends parallel with and above ill the portion of the stationary electrode {t in advance of the guide 8. The plate 9 is in the form of a dove-tailed tongue slidably n'iounted in the groove in the guide 8 and inserlible therein from the upper end thereof. The movable electrode 10 is supported from and electrically connected with the upper end of the secondary K by means of a conductor 13, in this disclosure shown to be an inverted ii of laminar metal, preferably of copper strips, having its opposite ends bolt ed, respectively, to the strip K and plate 9.

Resting upon the portion of the stationary electrode 4- in advance of the guide 8, and spaced from this electrode and positioned beneath the ledge 11 is a receptacle 11- adapted to contain a portion of the rivet, as shown at to. This receptacle is herein shown to be a rectangular box opened at top and bottom, but it of course, to be under stood that this receptacle may be cylindrical to accommodate rivcts or other members to be heated, or may be divided into a series of eon'iparrtments to simultaneously heat several articles, if desired. T he portion of the stationary elec rode below the receptacle 1% has an open 16 extending therethrough and communicating with the opening 17 in the bottom of the receptacle H, which opening is tapped to form screw threads. Adapted to be tszjeadcd into opening through the underside of the electrode e is an ad justable set screw" ltl, which set screw may have formed as a part thereof, or, shown in the draivrngs, may support tie die 19, which die is shown to have a recess 0 formed in its top face. This recess is adapted to substantially tit the contour of the head of the rivet or work to be heated, so that a c oir tact willbe madeat this point between the stationary electrode and a material extent of the top curved surface of the head of the rivet, it being understood that for bolt or rivet heads of different configurations dies having different-shaped co-acting top faces may substituted, as applicants object is to afford the maximum area of contact between the electrode and the end of the article to be heated. It is merely necessary to form the die with a contacting face, taking the shape of the negative of the contacting face of the article to be heated, so that should this article, for instance, have a concave end,

the die would have a similarly shaped protuberance adapted to fit this concavity. The adjusting screw 18 permits the variation in the position of the bottom of the receptacle relative to its open top, so that the rivet or other article to be heated may project from the receptacle any desired amount, it being understood that the movable electrode 10 is lowered in a manner hereinafter described to contact with the upper end of the rivet to press the same on to the die 19, and to complete the circuit through the secondary and aeeo through the entire length of the article to be heated.

It is a disadvantage at present in heating headed rivets or other articles having a greater mass of material at one portion than another, that the portions of less mass heat more quickly than portions of greater mass, tending, of course, to burn certain portions before the other portions have been heated to riveting or other desired temperatures. A specific object of this disclosure is to obviate this difficulty in the case of heating rivets, and with this in view the heated end is inclosed by the receptacle 1 1, permitting the pointed end to be exposed, thereby facilitating heat radiation from the pointed end but retarding this radiation from the headed end, which, of course, has the tendency of heating the pointed end more slowly than the headed end.

To protect the operator from sparks or glare, and at the same time to permit him to observe the operation, there is disposed about the ledge 11 and depending therefrom a shield 21 of mica or similar substance, which shield telescopes the outside of the receptacle l4 and the upper portion of the rivet 15.

As shown in the illustration, the device may be operated by a hand lever 22, or a foot pedal 23 arranged in any suitable manner, and for the purpose ofthis disclosure there is shown supported from the upper plate B a standard 2%, pivoted to which intermediate its length is the lever 22, the handle portion ofwhich is conveniently located to the operator and extends rearwardly, and has pivoted to the rear end a depending link 32, the lower end of which is pivoted to the rear end of the pedal lever 33, which lever is fulcrumed at 25 to a depending bracket 26 forming a part of the support A and extending parallel with the lever 22.

The device thus described is connected to the movable electrode by means of a link connection 27 between the electrode and the lever 22. This link connection comprises an inverted U-shaped strap 28, having one leg hacked to the plate 9 and the other leg dlsposed between the front face of the said plate and the adjacent end of the conductor 13, the bolt fastening the conductors also be ing utilized to fasten this strap. Pivotally mounted in the strap above theplate 9 and positioned in a suitable bearing in the lever 22 is the pivoting pin 30, which pin is insulated from the lever 22 by means of the insulating bushing 31 in said bear ng. It will be seen by this construction that manipulating either the levers 22 or 23 will raise and lower the movable electrode from and into contact with the rivet 15, thereby constituting a mcans'for completing the circuit through the secondary and rivet, heating the rivet or other article to be heated to any desired temperature.

While the device illustrated has been described with some detail, it is, of course, to be understood that applicants are not limiting themsrclves'to the specific embodiment disclosed, but that other means may be devised to accomplish the objects above out lined and more specifically defined in the appended claims. I

What We claim is:

1. In an electric furnace for heating rivets, the combination including a heating chamber formed with a bottom forming an electrode and adapted to receive the head of the rivet, and a movable electrode adapted to be brought into engagement with the end of the rivet opposite the head to complete the circuit through the same.

2. In an'electric furnace for heating metal articles, in combination an open top heating chamber adapted to contain one end of the article to be heated, said receptacle having an adjustable bottom portion constituting an electrode adapted to contact with said article and vary the proportion of the article Within and the portion of the article extending from the receptacle;

3. Anelectric furnace including a receptacle having a removable and adjustable member -therein adapted to support the article to be heated and constituting an electrode, and a second movable electrode adapted to contact with the top of the article.

4:. An electric furnace, including a heat? ing chamber adapted to contain a'portion of the article to be heated, an adjustable base supporting means for the article to be heated, and electrodes eXteriorly of said receptacle one of which is adapted to be brought into electrical contact with said article to complete a heatingcircuit therethrough. i

5. In an electric furnace adapted to heat rivets, an electrode including a heating chamber and a die in said chamber adapted to fit the head of the rivet, whereby a maxi mum area of contact is afforded between the electrode and the head of the rivet in said chamber.

6. In an electric furnace, a heating chamber, a stationary electrode, an adjustable die carried by said electrode adapted to close the bottom of said chamber and support thereon the article to be heated, and amovable elec trode adapted to bear on said article to bring the same in firm engagei'ncnt with said die and to complete a circuit therethrough.

7. In an electric furnace, an open top. receptacle, an electrode in said receptacle adapted to support the article to be heated, at second electrode adapted to be moved into contact with the top of the article, and a protecting screen carried by said movable electrode.

8. In an electric furnace, a vertically disposed guide, an electrode slidably mounted in said guide, a secondary and a flexible conductor electrically connecting said secondary and electrode and supporting said electrode in said guide.

9. In an electric furnace, a vertically disposed guide, an electrode slidably mounted in said guide, a secondary and a flexible conductor electrically connecting said secondary and electrode and supporting said elect-rode in said guide, and means for actuating said electrode.

10. In. an electric furnace, a pair of spaced insulating plates, a transformer held. between said plates, a stationary electrode held in insulated position from one of said plates, said electrode electrically connected with the secondary of the transformer, a second electrode electrically connected with said secondary, and means guiding said second electrode in its movement relative to said stationary electrode.

-11. In an electric furnace, a secondary 1nto the opposite end of said strip, a movable.

electrode oppositely disposed to said first mentioned electrode and supported by said conductor, and alever controlling said movable electrode.

13. In an electric furnace, a heating chamher, an electrode forming the bottom of said chamber, and an electrode exteriorly of said chamber adapted to have positioned therebetween. the article to be heated, said receptacle being adapted to inclose part of the article to be heated and one of the electrodes being movable in operation independently of the article to be heated.

14:. In an electric furnace, a heating chamber, in combination with a pair of electrodes adapted to engage opposite ends of an article to be heated, of means adapted to inclose a port-ion of the article to retard the rate of heat radiation from certain portions thereof, and adjustable means forming part of one of the electrodes adaptedto adjust the capacity of the heating chamber.

15. In an electric heating furnace, a pair of electrodes, one of which is movable and one of which is stationary, a heating chamber supported on one electrode, and means in circuit with the stationary electrode adapted to vary the capacity of said heating chamber.

16. In an electric heating furnace, a pair of electrodes, a heating chamber supported by one of said electrodes, and an adjustable member in circuit with said supporting electrode forming the bottom of said chamber and adapted to Vary the capacity of said heating chamber.

1 In an electric furnace, a heating chamber, an electrode, an adjustable supporting member connected With the electrode and extending into said heating chamber, and a second and movable electrode adapted to contact with an article positioned in the said chamber.

1.8. In an electric furnace, a heating chaincontact \Ylbll the top of an :11 ticle positioned the said cherub In with whereof We have hereunto set our hands in the presence of two Witnesses.

VIILLI tlli 3 JOHEPISQN.

50H RV. SHEFFER. 

